A political junkie? Have the Sundance Channel on your TV? Then you’ll want to tune in tonight for “The Return of the War Room.” The documentary filmmakers who made the acclaimed movie about the 1992 Clinton campaign war room catch up with the key figures in the 1992 work — James Carville, Paul Begala and George Stephanopoulos. They talk about whether the instant-response tactics of 1992 have continued or been transformed. The original will be shown again after the 90-minute new documentary.